package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.entity.Setmeal;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

@Service
@Slf4j
public class DishServiceImpl implements DishService {

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private DishFlavorMapper dishFlavorMapper;

    @Autowired
    private SetmealDishMapper setmealDishMapper;
    @Autowired
    private SetmealMapper setmealMapper;

    /*
     * 新增菜品和对应的口味数据
     */
    @Transactional
    public void saveWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        //数据拷贝
        BeanUtils.copyProperties(dishDTO, dish);
        //向菜品表插入1条数据
        dishMapper.insert(dish);

        //获取insert语句生成的主键值
        Long dishId = dish.getId();

        List<DishFlavor> flavors = dishDTO.getFlavors();
        if(flavors != null && flavors.size() > 0) {
            for(DishFlavor flavor : flavors) {
                flavor.setDishId(dishId);
            }
            //向口味表插入n条数据
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    /*
     * 菜品分页查询
     */
    public PageResult pageQueryDto(DishPageQueryDTO dishPageQueryDTO) {

        PageHelper.startPage(dishPageQueryDTO.getPage(),dishPageQueryDTO.getPageSize());
        Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);
        return new PageResult(page.getTotal(),page.getResult());
    }

    /*
     * 菜品批量删除
     */
    @Transactional
    public void deleteBatch(List<Long> ids) {
        //判断当前菜品是否能够删除---是否存在起售中的菜品 ?
        List<Integer> statusList = dishMapper.getByIds(ids);
        if(statusList != null && statusList.size() >0){
            for (Integer status:statusList){
                if(status == StatusConstant.ENABLE){
                    //当前菜品处于起售中，不能删除
                    throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
                }
            }
        }
//        for(Long id : ids) {
//            Dish dish = dishMapper.getById(id);
//            if(dish.getStatus() == StatusConstant.ENABLE){
//                //当前菜品处于起售中，不能删除
//                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
//            }
//        }

        //判断当前菜品是否能够删除---是否被套餐关联 ?
        List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(ids);
        if(setmealIds != null && setmealIds.size() > 0){
            //当前套餐被菜品关联了，不能删除
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }
        //删除菜品表中的菜品数据
/*        for(Long id : ids) {
            dishMapper.deleteById(id);
            //继续删除菜品关联的口味数据
            dishFlavorMapper.deleteByDishId(id);
        }*/

        //根据菜品id集合批量删除菜品数据
        //sql: delete from dish where id in (?,?,?)
        dishMapper.deleteByIds(ids);
        //根据菜品id集合关联的口味数据
        //sql: delete from dish_flavor where dish_id in (?,?,?)
        dishFlavorMapper.deleteByDishIds(ids);
    }

    /*
     * 根据id查询菜品及对应的口味数据
     */
    public DishVO getByIdWithFlavor(Long id) {
        //根据id查询菜品数据
        Dish dish = dishMapper.getById(id);

        //根据菜品id查询口味数据
        List<DishFlavor> dishFlavors = dishFlavorMapper.getByDishId(id);

        //将查询到的数据封装到VO
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish,dishVO);
        dishVO.setFlavors(dishFlavors);

        return dishVO;
    }

    /*
     * 根据id修改菜品的基本信息和对应的口味信息
     */
    @Transactional
    public void updateWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);

        //修改菜品表的基本信息
        dishMapper.update(dish);

        //删除原有的口味数据
        dishFlavorMapper.deleteByDishId(dishDTO.getId());
        //重新插入口味数据
        List<DishFlavor> dishFlavors = dishDTO.getFlavors();
        if(dishFlavors != null && dishFlavors.size() > 0){
            for (DishFlavor dishFlavor : dishFlavors) {
                //为顾客选择的菜品口味设置对应的菜品id
                dishFlavor.setDishId(dishDTO.getId());
            }
            //向口味表插入n条数据
            dishFlavorMapper.insertBatch(dishFlavors);
        }
    }

    /*
     * 启用禁用菜品
     */
    public void startOrStop(Integer status, Long id) {
        //起售菜品直接修改数据
        Dish dish = new Dish();
        dish.setId(id);
        dish.setStatus(status);
        dishMapper.update(dish);

        //如果是停售操作，还需要将包含当前菜品的套餐也停售
        List<Long> ids = new ArrayList<>();
        ids.add(id);
        if(status == StatusConstant.DISABLE){
            List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(ids);
            if(setmealIds != null && setmealIds.size() > 0){
                for (Long setmealId : setmealIds) {
                    Setmeal setmeal = new Setmeal();
                    setmeal.setId(setmealId);
                    setmeal.setStatus(StatusConstant.DISABLE);
                    setmealMapper.update(setmeal);
                }
            }
        }
    }

    @Override
    public List<Dish> getByCategoryId(Long categoryId) {
        return dishMapper.getByCategoryId(categoryId);
    }

    //根据分类id查询菜品和口味信息
    public List<DishVO> getByCategoryIdWithFlavor(Dish dish) {
        //根据分类id和起售状态为1，查询菜品数据
        List<Dish> dishes = dishMapper.getByDish(dish);

        List<DishVO> dishVOS = new ArrayList<>();

        //根据菜品id查询口味数据
        for(Dish d : dishes){
            List<DishFlavor> dishFlavors = dishFlavorMapper.getByDishId(d.getId());
            //将查询到的数据封装到VO
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);
            dishVO.setFlavors(dishFlavors);
            dishVOS.add(dishVO);
        }

        return dishVOS;
    }


}
